| Rouen to Navodari | 1,338.84 mi (2,154.66 km) |
| Rouen to Negresti-Oas | 1,021.42 mi (1,643.81 km) |
| Rouen to Nehoiu | 1,206.57 mi (1,941.79 km) |
| Rouen to Ocna Mures | 1,071.03 mi (1,723.65 km) |
| Rouen to Odobesti | 1,230.06 mi (1,979.59 km) |
| Rouen to Odorheiu Secuiesc | 1,137.52 mi (1,830.67 km) |
| Rouen to Oltenita | 1,257.54 mi (2,023.82 km) |
| Rouen to Onesti | 1,204.73 mi (1,938.83 km) |
| Rouen to Oradea | 968.98 mi (1,559.43 km) |
| Rouen to Orastie | 1,054.60 mi (1,697.21 km) |
| Rouen to Oravita | 1,009.19 mi (1,624.14 km) |
| Rouen to Orsova | 1,049.95 mi (1,689.73 km) |
| Rouen to Otelu Rosu | 1,025.45 mi (1,650.29 km) |
| Rouen to Otopeni | 1,218.46 mi (1,960.92 km) |
| Rouen to Ovidiu | 1,337.96 mi (2,153.23 km) |
